Companies that design, develop, manufacture, distribute or
install equipment and services for reduction, prevention or
clean-up of air or soil pollution. Pollutants include sulphur
dioxide, nitrous oxide, mercury particulates, carbon, monoxide and
carbon dioxide. Principal areas are the industrial and power
generation sectors (such as smoke stack scrubbing technologies),
and the transportation sector (such as particulate filters and
catalytic converters). This also includes companies facilitating
the substitution of more polluting fuels by cleaner burning fuels
in areas of chronic air pollution.